Balanço de sólidos e nutrientes em sistema de alagado construído para tratamento de resíduos de fossa e tanque séptico
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Data
2013
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Resumo
Cesspits and septic tanks wastes (CSTW) should be treated prior to disposal in the environment. The use of constructed wetland systems (CWS's) emerges as an
alternative technology, simple and low cost, efficient and with great potential for
practical use. Thus, this work aimed to study the flow of solids and nutrients in a
CWS for treating CSTW. Two tanks were built and filled with overlapping layers of
gravel and sand for application and treatment of CSTW. A tank was grown by the
plant species Vetiver Grass (Vetiveria zizanioides) and the other worked as control.
Physicochemical analyses of crude residue and treated both tanks were made to
calculate the efficiency of the treatment, which took into account the
evapotranspiration rates of the tanks. The vegetated tank was more efficient in
removing total solids, settleable and fixed solids, and total phosphorus and ammonia
nitrogen. Both tanks showed variations in their efficiency, mainly due to varying
application rates. Due to the high volume of ammonia, the CWS was not enough to
compliance with environmental legislation, requiring further treatment of their effluent.
A high accumulation of sludge on the surface of both systems with higher moisture in
the tank vegetated. For the operation of these systems, it is recommended that the
study of optimum rates of application.
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Palavras-chave
Zona de raízes, Balanço de massa, Fitorremediação, Root zone, Phytoremediation, Mass budget
Citação
SILVA JR., Édio et al. Balanço de sólidos e nutrientes em sistema de alagado construído para tratamento de resíduos de fossa e tanque séptico. Enciclopédia Biosfera, Jandaia, v. 9, n. 17, p. 3281-3291, 2013.